A067477 Smallest n-digit square starting with 7.

729, 7056, 70225, 700569, 7001316, 70006689, 700025764, 7000166889, 70000459776, 700001628921, 7000003645504, 70000012293201, 700000047060196, 7000000057996009, 70000000472817424, 700000000779640729

Offset

3,1

Links

Table of n, a(n) for n=3..18.

Formula

a(n) = ceiling(sqrt(7*10^(n-1)))^2, n>2. - Rick L. Shepherd, Feb 18 2002

Prog

(PARI) for(n=3, 22, a=ceil(sqrt(7*10^(n-1)))^2; print(a))

Crossrefs

Cf. A035074 (roots), A067472-A067479 (2..9).

Sequence in context: A233159 A217969 A017379 * A034991 A017499 A269057

Adjacent sequences: A067474 A067475 A067476 * A067478 A067479 A067480

Keyword

base,easy,nonn

Author

Amarnath Murthy, Feb 09 2002

Extensions

More terms from Rick L. Shepherd, Feb 18 2002

Status

approved